Another 4.5inch case i need help with.This is marked as follows 4.5 IN MKS 3-5 GUNS N5 ECC 0 1962,Electric primer. It is aprox 145mm x 402,rim dia 166mm.I want to know is this correct size? im sure i read that these marks of 4.5 inch gun were seperate loading not QF as per other marks.The case looks to be original and the mouth is perfectly machined so i think its correct,but have no info.Cheers Tigbrand.